aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/ne2.c
blob: 6f8f32603466384df3b2df1805fd2ce38cb6f4cc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
/* ne2.c: A NE/2 Ethernet Driver for Linux. */
/*
   Based on the NE2000 driver written by Donald Becker (1992-94).
   modified by Wim Dumon (Apr 1996)

   This software may be used and distributed according to the terms
   of the GNU General Public License, incorporated herein by reference.

   The author may be reached as wimpie@linux.cc.kuleuven.ac.be

   Currently supported: NE/2
   This patch was never tested on other MCA-ethernet adapters, but it
   might work. Just give it a try and let me know if you have problems.
   Also mail me if it really works, please!

   Changelog:
   Mon Feb  3 16:26:02 MET 1997
   - adapted the driver to work with the 2.1.25 kernel
   - multiple ne2 support (untested)
   - module support (untested)

   Fri Aug 28 00:18:36 CET 1998 (David Weinehall)
   - fixed a few minor typos
   - made the MODULE_PARM conditional (it only works with the v2.1.x kernels)
   - fixed the module support (Now it's working...)

   Mon Sep  7 19:01:44 CET 1998 (David Weinehall)
   - added support for Arco Electronics AE/2-card (experimental)

   Mon Sep 14 09:53:42 CET 1998 (David Weinehall)
   - added support for Compex ENET-16MC/P (experimental)

   Tue Sep 15 16:21:12 CET 1998 (David Weinehall, Magnus Jonsson, Tomas Ogren)
   - Miscellaneous bugfixes

   Tue Sep 19 16:21:12 CET 1998 (Magnus Jonsson)
   - Cleanup

   Wed Sep 23 14:33:34 CET 1998 (David Weinehall)
   - Restructuring and rewriting for v2.1.x compliance

   Wed Oct 14 17:19:21 CET 1998 (David Weinehall)
   - Added code that unregisters irq and proc-info
   - Version# bump

   Mon Nov 16 15:28:23 CET 1998 (Wim Dumon)
   - pass 'dev' as last parameter of request_irq in stead of 'NULL'

   Wed Feb  7 21:24:00 CET 2001 (Alfred Arnold)
   - added support for the D-Link DE-320CT

   *    WARNING
	-------
	This is alpha-test software.  It is not guaranteed to work. As a
	matter of fact, I'm quite sure there are *LOTS* of bugs in here. I
	would like to hear from you if you use this driver, even if it works.
	If it doesn't work, be sure to send me a mail with the problems !
*/

static const char *version = "ne2.c:v0.91 Nov 16 1998 Wim Dumon <wimpie@kotnet.org>\n";

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mca-legacy.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/jiffies.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>

#include "8390.h"

#define DRV_NAME "ne2"

/* Some defines that people can play with if so inclined. */

/* Do we perform extra sanity checks on stuff ? */
/* #define NE_SANITY_CHECK */

/* Do we implement the read before write bugfix ? */
/* #define NE_RW_BUGFIX */

/* Do we have a non std. amount of memory? (in units of 256 byte pages) */
/* #define PACKETBUF_MEMSIZE	0x40 */


/* ---- No user-serviceable parts below ---- */

#define NE_BASE	 (dev->base_addr)
#define NE_CMD	 	0x00
#define NE_DATAPORT	0x10	/* NatSemi-defined port window offset. */
#define NE_RESET	0x20	/* Issue a read to reset, a write to clear. */
#define NE_IO_EXTENT	0x30

#define NE1SM_START_PG	0x20	/* First page of TX buffer */
#define NE1SM_STOP_PG 	0x40	/* Last page +1 of RX ring */
#define NESM_START_PG	0x40	/* First page of TX buffer */
#define NESM_STOP_PG	0x80	/* Last page +1 of RX ring */

/* From the .ADF file: */
static unsigned int addresses[7] __initdata =
		{0x1000, 0x2020, 0x8020, 0xa0a0, 0xb0b0, 0xc0c0, 0xc3d0};
static int irqs[4] __initdata = {3, 4, 5, 9};

/* From the D-Link ADF file: */
static unsigned int dlink_addresses[4] __initdata =
                {0x300, 0x320, 0x340, 0x360};
static int dlink_irqs[8] __initdata = {3, 4, 5, 9, 10, 11, 14, 15};

struct ne2_adapters_t {
	unsigned int	id;
	char		*name;
};

static struct ne2_adapters_t ne2_adapters[] __initdata = {
	{ 0x6354, "Arco Ethernet Adapter AE/2" },
	{ 0x70DE, "Compex ENET-16 MC/P" },
	{ 0x7154, "Novell Ethernet Adapter NE/2" },
        { 0x56ea, "D-Link DE-320CT" },
	{ 0x0000, NULL }
};

extern int netcard_probe(struct net_device *dev);

static int ne2_probe1(struct net_device *dev, int slot);

static int ne_open(struct net_device *dev);
static int ne_close(struct net_device *dev);

static void ne_reset_8390(struct net_device *dev);
static void ne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
		int ring_page);
static void ne_block_input(struct net_device *dev, int count,
		struct sk_buff *skb, int ring_offset);
static void ne_block_output(struct net_device *dev, const int count,
		const unsigned char *buf, const int start_page);


/*
 * special code to read the DE-320's MAC address EEPROM.  In contrast to a
 * standard NE design, this is a serial EEPROM (93C46) that has to be read
 * bit by bit.  The EEPROM cotrol port at base + 0x1e has the following
 * layout:
 *
 * Bit 0 = Data out (read from EEPROM)
 * Bit 1 = Data in  (write to EEPROM)
 * Bit 2 = Clock
 * Bit 3 = Chip Select
 * Bit 7 = ~50 kHz clock for defined delays
 *
 */

static void __init dlink_put_eeprom(unsigned char value, unsigned int addr)
{
	int z;
	unsigned char v1, v2;

	/* write the value to the NIC EEPROM register */

	outb(value, addr + 0x1e);

	/* now wait the clock line to toggle twice.  Effectively, we are
	   waiting (at least) for one clock cycle */

	for (z = 0; z < 2; z++) {
		do {
			v1 = inb(addr + 0x1e);
			v2 = inb(addr + 0x1e);
		}
		while (!((v1 ^ v2) & 0x80));
	}
}

static void __init dlink_send_eeprom_bit(unsigned int bit, unsigned int addr)
{
	/* shift data bit into correct position */

	bit = bit << 1;

	/* write value, keep clock line high for two cycles */

	dlink_put_eeprom(0x09 | bit, addr);
	dlink_put_eeprom(0x0d | bit, addr);
	dlink_put_eeprom(0x0d | bit, addr);
	dlink_put_eeprom(0x09 | bit, addr);
}

static void __init dlink_send_eeprom_word(unsigned int value, unsigned int len, unsigned int addr)
{
	int z;

	/* adjust bits so that they are left-aligned in a 16-bit-word */

	value = value << (16 - len);

	/* shift bits out to the EEPROM */

	for (z = 0; z < len; z++) {
		dlink_send_eeprom_bit((value & 0x8000) >> 15, addr);
		value = value << 1;
	}
}

static unsigned int __init dlink_get_eeprom(unsigned int eeaddr, unsigned int addr)
{
	int z;
	unsigned int value = 0;

	/* pull the CS line low for a moment.  This resets the EEPROM-
	   internal logic, and makes it ready for a new command. */

	dlink_put_eeprom(0x01, addr);
	dlink_put_eeprom(0x09, addr);

	/* send one start bit, read command (1 - 0), plus the address to
           the EEPROM */

	dlink_send_eeprom_word(0x0180 | (eeaddr & 0x3f), 9, addr);

	/* get the data word.  We clock by sending 0s to the EEPROM, which
	   get ignored during the read process */

	for (z = 0; z < 16; z++) {
		dlink_send_eeprom_bit(0, addr);
		value = (value << 1) | (inb(addr + 0x1e) & 0x01);
	}

	return value;
}

/*
 * Note that at boot, this probe only picks up one card at a time.
 */

static int __init do_ne2_probe(struct net_device *dev)
{
	static int current_mca_slot = -1;
	int i;
	int adapter_found = 0;

	/* Do not check any supplied i/o locations.
	   POS registers usually don't fail :) */

	/* MCA cards have POS registers.
	   Autodetecting MCA cards is extremely simple.
	   Just search for the card. */

	for(i = 0; (ne2_adapters[i].name != NULL) && !adapter_found; i++) {
		current_mca_slot =
			mca_find_unused_adapter(ne2_adapters[i].id, 0);

		if((current_mca_slot != MCA_NOTFOUND) && !adapter_found) {
			int res;
			mca_set_adapter_name(current_mca_slot,
					ne2_adapters[i].name);
			mca_mark_as_used(current_mca_slot);

			res = ne2_probe1(dev, current_mca_slot);
			if (res)
				mca_mark_as_unused(current_mca_slot);
			return res;
		}
	}
	return -ENODEV;
}

#ifndef MODULE
struct net_device * __init ne2_probe(int unit)
{
	struct net_device *dev = alloc_eip_netdev();
	int err;

	if (!dev)
		return ERR_PTR(-ENOMEM);

	sprintf(dev->name, "eth%d", unit);
	netdev_boot_setup_check(dev);

	err = do_ne2_probe(dev);
	if (err)
		goto out;
	return dev;
out:
	free_netdev(dev);
	return ERR_PTR(err);
}
#endif

static int ne2_procinfo(char *buf, int slot, struct net_device *dev)
{
	int len=0;

	len += sprintf(buf+len, "The NE/2 Ethernet Adapter\n" );
	len += sprintf(buf+len, "Driver written by Wim Dumon ");
	len += sprintf(buf+len, "<wimpie@kotnet.org>\n");
	len += sprintf(buf+len, "Modified by ");
	len += sprintf(buf+len, "David Weinehall <tao@acc.umu.se>\n");
	len += sprintf(buf+len, "and by Magnus Jonsson <bigfoot@acc.umu.se>\n");
	len += sprintf(buf+len, "Based on the original NE2000 drivers\n" );
	len += sprintf(buf+len, "Base IO: %#x\n", (unsigned int)dev->base_addr);
	len += sprintf(buf+len, "IRQ    : %d\n", dev->irq);
	len += sprintf(buf+len, "HW addr : %pM\n", dev->dev_addr);

	return len;
}

static int __init ne2_probe1(struct net_device *dev, int slot)
{
	int i, base_addr, irq, retval;
	unsigned char POS;
	unsigned char SA_prom[32];
	const char *name = "NE/2";
	int start_page, stop_page;
	static unsigned version_printed;

	if (ei_debug && version_printed++ == 0)
		printk(version);

	printk("NE/2 ethercard found in slot %d:", slot);

	/* Read base IO and IRQ from the POS-registers */
	POS = mca_read_stored_pos(slot, 2);
	if(!(POS % 2)) {
		printk(" disabled.\n");
		return -ENODEV;
	}

	/* handle different POS register structure for D-Link card */

	if (mca_read_stored_pos(slot, 0) == 0xea) {
		base_addr = dlink_addresses[(POS >> 5) & 0x03];
		irq = dlink_irqs[(POS >> 2) & 0x07];
	}
        else {
		i = (POS & 0xE)>>1;
		/* printk("Halleluja sdog, als er na de pijl een 1 staat is 1 - 1 == 0"
	   	" en zou het moeten werken -> %d\n", i);
	   	The above line was for remote testing, thanx to sdog ... */
		base_addr = addresses[i - 1];
		irq = irqs[(POS & 0x60)>>5];
	}

	if (!request_region(base_addr, NE_IO_EXTENT, DRV_NAME))
		return -EBUSY;

#ifdef DEBUG
	printk("POS info : pos 2 = %#x ; base = %#x ; irq = %ld\n", POS,
			base_addr, irq);
#endif

#ifndef CRYNWR_WAY
	/* Reset the card the way they do it in the Crynwr packet driver */
	for (i=0; i<8; i++)
		outb(0x0, base_addr + NE_RESET);
	inb(base_addr + NE_RESET);
	outb(0x21, base_addr + NE_CMD);
	if (inb(base_addr + NE_CMD) != 0x21) {
		printk("NE/2 adapter not responding\n");
		retval = -ENODEV;
		goto out;
	}

	/* In the crynwr sources they do a RAM-test here. I skip it. I suppose
	   my RAM is okay.  Suppose your memory is broken.  Then this test
	   should fail and you won't be able to use your card.  But if I do not
	   test, you won't be able to use your card, neither.  So this test
	   won't help you. */

#else  /* _I_ never tested it this way .. Go ahead and try ...*/
	/* Reset card. Who knows what dain-bramaged state it was left in. */
	{
		unsigned long reset_start_time = jiffies;

		/* DON'T change these to inb_p/outb_p or reset will fail on
		   clones.. */
		outb(inb(base_addr + NE_RESET), base_addr + NE_RESET);

		while ((inb_p(base_addr + EN0_ISR) & ENISR_RESET) == 0)
			if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
				printk(" not found (no reset ack).\n");
				retval = -ENODEV;
				goto out;
			}

		outb_p(0xff, base_addr + EN0_ISR);         /* Ack all intr. */
	}
#endif


	/* Read the 16 bytes of station address PROM.
	   We must first initialize registers, similar to
	   NS8390p_init(eifdev, 0).
	   We can't reliably read the SAPROM address without this.
	   (I learned the hard way!). */
	{
		struct {
			unsigned char value, offset;
		} program_seq[] = {
						/* Select page 0 */
			{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD},
			{0x49,	EN0_DCFG},  /* Set WORD-wide (0x49) access. */
			{0x00,	EN0_RCNTLO},  /* Clear the count regs. */
			{0x00,	EN0_RCNTHI},
			{0x00,	EN0_IMR},  /* Mask completion irq. */
			{0xFF,	EN0_ISR},
			{E8390_RXOFF, EN0_RXCR},  /* 0x20  Set to monitor */
			{E8390_TXOFF, EN0_TXCR},  /* 0x02  and loopback mode. */
			{32,	EN0_RCNTLO},
			{0x00,	EN0_RCNTHI},
			{0x00,	EN0_RSARLO},  /* DMA starting at 0x0000. */
			{0x00,	EN0_RSARHI},
			{E8390_RREAD+E8390_START, E8390_CMD},
		};

		for (i = 0; i < ARRAY_SIZE(program_seq); i++)
			outb_p(program_seq[i].value, base_addr +
				program_seq[i].offset);

	}
	for(i = 0; i < 6 /*sizeof(SA_prom)*/; i+=1) {
		SA_prom[i] = inb(base_addr + NE_DATAPORT);
	}

	/* I don't know whether the previous sequence includes the general
           board reset procedure, so better don't omit it and just overwrite
           the garbage read from a DE-320 with correct stuff. */

	if (mca_read_stored_pos(slot, 0) == 0xea) {
		unsigned int v;

		for (i = 0; i < 3; i++) {
 			v = dlink_get_eeprom(i, base_addr);
			SA_prom[(i << 1)    ] = v & 0xff;
			SA_prom[(i << 1) + 1] = (v >> 8) & 0xff;
		}
	}

	start_page = NESM_START_PG;
	stop_page = NESM_STOP_PG;

	dev->irq=irq;

	/* Snarf the interrupt now.  There's no point in waiting since we cannot
	   share and the board will usually be enabled. */
	retval = request_irq(dev->irq, eip_interrupt, 0, DRV_NAME, dev);
	if (retval) {
		printk (" unable to get IRQ %d (irqval=%d).\n",
				dev->irq, retval);
		goto out;
	}

	dev->base_addr = base_addr;

	for(i = 0; i < ETHER_ADDR_LEN; i++)
		dev->dev_addr[i] = SA_prom[i];

	printk(" %pM\n", dev->dev_addr);

	printk("%s: %s found at %#x, using IRQ %d.\n",
			dev->name, name, base_addr, dev->irq);

	mca_set_adapter_procfn(slot, (MCA_ProcFn) ne2_procinfo, dev);

	ei_status.name = name;
	ei_status.tx_start_page = start_page;
	ei_status.stop_page = stop_page;
	ei_status.word16 = (2 == 2);

	ei_status.rx_start_page = start_page + TX_PAGES;
#ifdef PACKETBUF_MEMSIZE
	/* Allow the packet buffer size to be overridden by know-it-alls. */
	ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
#endif

	ei_status.reset_8390 = &ne_reset_8390;
	ei_status.block_input = &ne_block_input;
	ei_status.block_output = &ne_block_output;
	ei_status.get_8390_hdr = &ne_get_8390_hdr;

	ei_status.priv = slot;

	dev->open = &ne_open;
	dev->stop = &ne_close;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = eip_poll;
#endif
	NS8390p_init(dev, 0);

	retval = register_netdev(dev);
	if (retval)
		goto out1;
	return 0;
out1:
	mca_set_adapter_procfn( ei_status.priv, NULL, NULL);
	free_irq(dev->irq, dev);
out:
	release_region(base_addr, NE_IO_EXTENT);
	return retval;
}

static int ne_open(struct net_device *dev)
{
	eip_open(dev);
	return 0;
}

static int ne_close(struct net_device *dev)
{
	if (ei_debug > 1)
		printk("%s: Shutting down ethercard.\n", dev->name);
	eip_close(dev);
	return 0;
}

/* Hard reset the card.  This used to pause for the same period that a
   8390 reset command required, but that shouldn't be necessary. */
static void ne_reset_8390(struct net_device *dev)
{
	unsigned long reset_start_time = jiffies;

	if (ei_debug > 1)
		printk("resetting the 8390 t=%ld...", jiffies);

	/* DON'T change these to inb_p/outb_p or reset will fail on clones. */
	outb(inb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);

	ei_status.txing = 0;
	ei_status.dmaing = 0;

	/* This check _should_not_ be necessary, omit eventually. */
	while ((inb_p(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
		if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
			printk("%s: ne_reset_8390() did not complete.\n",
					dev->name);
			break;
		}
	outb_p(ENISR_RESET, NE_BASE + EN0_ISR);	/* Ack intr. */
}

/* Grab the 8390 specific header. Similar to the block_input routine, but
   we don't need to be concerned with ring wrap as the header will be at
   the start of a page, so we optimize accordingly. */

static void ne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
		int ring_page)
{

	int nic_base = dev->base_addr;

	/* This *shouldn't* happen.
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_get_8390_hdr "
				"[DMAstat:%d][irqlock:%d].\n",
				dev->name, ei_status.dmaing, ei_status.irqlock);
		return;
	}

	ei_status.dmaing |= 0x01;
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
	outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
	outb_p(0, nic_base + EN0_RCNTHI);
	outb_p(0, nic_base + EN0_RSARLO);		/* On page boundary */
	outb_p(ring_page, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);

	if (ei_status.word16)
		insw(NE_BASE + NE_DATAPORT, hdr,
				sizeof(struct e8390_pkt_hdr)>>1);
	else
		insb(NE_BASE + NE_DATAPORT, hdr,
				sizeof(struct e8390_pkt_hdr));

	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
}

/* Block input and output, similar to the Crynwr packet driver.  If you
   are porting to a new ethercard, look at the packet driver source for
   hints. The NEx000 doesn't share the on-board packet memory -- you have
   to put the packet out through the "remote DMA" dataport using outb. */

static void ne_block_input(struct net_device *dev, int count, struct sk_buff *skb,
		int ring_offset)
{
#ifdef NE_SANITY_CHECK
	int xfer_count = count;
#endif
	int nic_base = dev->base_addr;
	char *buf = skb->data;

	/* This *shouldn't* happen.
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_block_input "
				"[DMAstat:%d][irqlock:%d].\n",
				dev->name, ei_status.dmaing, ei_status.irqlock);
		return;
	}
	ei_status.dmaing |= 0x01;
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
	outb_p(count & 0xff, nic_base + EN0_RCNTLO);
	outb_p(count >> 8, nic_base + EN0_RCNTHI);
	outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
	outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
	if (ei_status.word16) {
		insw(NE_BASE + NE_DATAPORT,buf,count>>1);
		if (count & 0x01) {
			buf[count-1] = inb(NE_BASE + NE_DATAPORT);
#ifdef NE_SANITY_CHECK
			xfer_count++;
#endif
		}
	} else {
		insb(NE_BASE + NE_DATAPORT, buf, count);
	}

#ifdef NE_SANITY_CHECK
	/* This was for the ALPHA version only, but enough people have
	   been encountering problems so it is still here.  If you see
	   this message you either 1) have a slightly incompatible clone
	   or 2) have noise/speed problems with your bus. */
	if (ei_debug > 1) {	/* DMA termination address check... */
		int addr, tries = 20;
		do {
			/* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here
			   -- it's broken for Rx on some cards! */
			int high = inb_p(nic_base + EN0_RSARHI);
			int low = inb_p(nic_base + EN0_RSARLO);
			addr = (high << 8) + low;
			if (((ring_offset + xfer_count) & 0xff) == low)
				break;
		} while (--tries > 0);
		if (tries <= 0)
			printk("%s: RX transfer address mismatch,"
				"%#4.4x (expected) vs. %#4.4x (actual).\n",
				dev->name, ring_offset + xfer_count, addr);
	}
#endif
	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
}

static void ne_block_output(struct net_device *dev, int count,
		const unsigned char *buf, const int start_page)
{
	int nic_base = NE_BASE;
	unsigned long dma_start;
#ifdef NE_SANITY_CHECK
	int retries = 0;
#endif

	/* Round the count up for word writes. Do we need to do this?
	   What effect will an odd byte count have on the 8390?
	   I should check someday. */
	if (ei_status.word16 && (count & 0x01))
		count++;

	/* This *shouldn't* happen.
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_block_output."
				"[DMAstat:%d][irqlock:%d]\n",
				dev->name, ei_status.dmaing, ei_status.irqlock);
		return;
	}
	ei_status.dmaing |= 0x01;
	/* We should already be in page 0, but to be safe... */
	outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);

#ifdef NE_SANITY_CHECK
retry:
#endif

#ifdef NE8390_RW_BUGFIX
	/* Handle the read-before-write bug the same way as the
	   Crynwr packet driver -- the NatSemi method doesn't work.
	   Actually this doesn't always work either, but if you have
	   problems with your NEx000 this is better than nothing! */
	outb_p(0x42, nic_base + EN0_RCNTLO);
	outb_p(0x00, nic_base + EN0_RCNTHI);
	outb_p(0x42, nic_base + EN0_RSARLO);
	outb_p(0x00, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
	/* Make certain that the dummy read has occurred. */
	SLOW_DOWN_IO;
	SLOW_DOWN_IO;
	SLOW_DOWN_IO;
#endif

	outb_p(ENISR_RDC, nic_base + EN0_ISR);

	/* Now the normal output. */
	outb_p(count & 0xff, nic_base + EN0_RCNTLO);
	outb_p(count >> 8,   nic_base + EN0_RCNTHI);
	outb_p(0x00, nic_base + EN0_RSARLO);
	outb_p(start_page, nic_base + EN0_RSARHI);

	outb_p(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
	if (ei_status.word16) {
		outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
	} else {
		outsb(NE_BASE + NE_DATAPORT, buf, count);
	}

	dma_start = jiffies;

#ifdef NE_SANITY_CHECK
	/* This was for the ALPHA version only, but enough people have
	   been encountering problems so it is still here. */

	if (ei_debug > 1) {		/* DMA termination address check... */
		int addr, tries = 20;
		do {
			int high = inb_p(nic_base + EN0_RSARHI);
			int low = inb_p(nic_base + EN0_RSARLO);
			addr = (high << 8) + low;
			if ((start_page << 8) + count == addr)
				break;
		} while (--tries > 0);
		if (tries <= 0) {
			printk("%s: Tx packet transfer address mismatch,"
					"%#4.4x (expected) vs. %#4.4x (actual).\n",
					dev->name, (start_page << 8) + count, addr);
			if (retries++ == 0)
				goto retry;
		}
	}
#endif

	while ((inb_p(nic_base + EN0_ISR) & ENISR_RDC) == 0)
		if (time_after(jiffies, dma_start + 2*HZ/100)) {		/* 20ms */
			printk("%s: timeout waiting for Tx RDC.\n", dev->name);
			ne_reset_8390(dev);
			NS8390p_init(dev, 1);
			break;
		}

	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
	return;
}


#ifdef MODULE
#define MAX_NE_CARDS	4	/* Max number of NE cards per module */
static struct net_device *dev_ne[MAX_NE_CARDS];
static int io[MAX_NE_CARDS];
static int irq[MAX_NE_CARDS];
static int bad[MAX_NE_CARDS];	/* 0xbad = bad sig or no reset ack */
MODULE_LICENSE("GPL");

module_param_array(io, int, NULL, 0);
module_param_array(irq, int, NULL, 0);
module_param_array(bad, int, NULL, 0);
MODULE_PARM_DESC(io, "(ignored)");
MODULE_PARM_DESC(irq, "(ignored)");
MODULE_PARM_DESC(bad, "(ignored)");

/* Module code fixed by David Weinehall */

int __init init_module(void)
{
	struct net_device *dev;
	int this_dev, found = 0;

	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
		dev = alloc_eip_netdev();
		if (!dev)
			break;
		dev->irq = irq[this_dev];
		dev->mem_end = bad[this_dev];
		dev->base_addr = io[this_dev];
		if (do_ne2_probe(dev) == 0) {
			dev_ne[found++] = dev;
			continue;
		}
		free_netdev(dev);
		break;
	}
	if (found)
		return 0;
	printk(KERN_WARNING "ne2.c: No NE/2 card found\n");
	return -ENXIO;
}

static void cleanup_card(struct net_device *dev)
{
	mca_mark_as_unused(ei_status.priv);
	mca_set_adapter_procfn( ei_status.priv, NULL, NULL);
	free_irq(dev->irq, dev);
	release_region(dev->base_addr, NE_IO_EXTENT);
}

void __exit cleanup_module(void)
{
	int this_dev;

	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
		struct net_device *dev = dev_ne[this_dev];
		if (dev) {
			unregister_netdev(dev);
			cleanup_card(dev);
			free_netdev(dev);
		}
	}
}
#endif /* MODULE */